Welcome to Koji’s documentation!


Koji is the software that builds RPM packages for the Fedora project. It uses Mock to create chroot environments to perform builds. To download the source code, report bugs, join the mailing list etc., see the Koji project website.



Setting up and using Koji on Fedora:

Koji Architecture


In Koji it is sometimes necessary to distinguish between a package in general, a specific build of a package, and the various rpm files created by a build. When precision is needed, these terms should be interpreted as follows:


The name of a source rpm. This refers to the package in general and not any particular build or subpackage. For example: kernel, glibc, etc.


A particular build of a package. This refers to the entire build: all arches and subpackages. For example: kernel-2.6.9-34.EL, glibc-2.3.4-2.19.


A particular rpm. A specific arch and subpackage of a build. For example: kernel-2.6.9-34.EL.x86_64, kernel-devel-2.6.9-34.EL.s390, glibc-2.3.4-2.19.i686, glibc-common-2.3.4-2.19.ia64

Quick overview of architecture and history is covered by Ken’s video.

Koji Components

Koji component structure diagram

Koji is comprised of several components:


koji-hub is the center of all Koji operations. It is an XML-RPC server running under mod_wsgi in Apache. koji-hub is passive in that it only receives XML-RPC calls and relies upon the build daemons and other components to initiate communication. koji-hub is the only component that has direct access to the database and is one of the two components that have write access to the file system.


kojid is the build daemon that runs on each of the build machines. Its primary responsibility is polling for incoming build requests and handling them accordingly. Essentially kojid asks koji-hub for work. Koji also has support for tasks other than building. Creating install images is one example. kojid is responsible for handling these tasks as well. kojid uses mock for building. It also creates a fresh buildroot for every build. kojid is written in Python and communicates with koji-hub via XML-RPC.


koji-web is a set of scripts that run in mod_wsgi and use the Cheetah templating engine to provide a web interface to Koji. It acts as a client to koji-hub providing a visual interface to perform a limited amount of administration. koji-web exposes a lot of information and also provides a means for certain operations, such as cancelling builds.


koji-client is a CLI written in Python that provides many hooks into Koji. It allows the user to query much of the data as well as perform actions such as adding users and initiating build requests.


kojira is a daemon that keeps the build root repodata updated. It is responsible for removing redundant build roots and cleaning up after a build request is completed.

Package Organization

Tags and Targets

Koji organizes packages using tags:

  • Tags are tracked in the database but not on disk

  • Tags support multiple inheritance

  • Each tag has its own list of valid packages (inheritable)

  • Package ownership can be set per-tag (inheritable)

  • Tag inheritance is more configurable

  • When you build you specify a target rather than a tag

A build target specifies where a package should be built and how it should be tagged afterwards. This allows target names to remain fixed as tags change through releases. You can get a full list of build targets with the following command:

$ koji list-targets

You can see just a single target with the –name option:

$ koji list-targets --name dist-fc7

Name                           Buildroot                      Destination
dist-fc7                       dist-fc7-build                 dist-fc7

This tells you a build for target dist-fc7 will use a buildroot with packages from the tag dist-fc7-build and tag the resulting packages as dist-fc7.

You can get a list of tags with the following command:

$ koji list-tags

Package lists

As mentioned above, each tag has its own list of packages that may be placed in the tag. To see that list for a tag, use the list-pkgs command:

$ koji list-pkgs --tag dist-fc7

Package                 Tag                     Extra Arches     Owner
----------------------- ----------------------- ---------------- ----------------
ElectricFence           dist-fc6                                 pmachata
GConf2                  dist-fc6                                 rstrode
lucene                  dist-fc6                                 dbhole
lvm2                    dist-fc6                                 lvm-team
ImageMagick             dist-fc6                                 nmurray
m17n-db                 dist-fc6                                 majain
m17n-lib                dist-fc6                                 majain
MAKEDEV                 dist-fc6                                 clumens

The first column is the name of the package, the second tells you which tag the package entry has been inherited from, and the third tells you the owner of the package.

Latest Builds

To see the latest builds for a tag, use the latest-build command:

$ koji latest-build --all dist-fc7

Build                                     Tag                   Built by
----------------------------------------  --------------------  ----------------
ConsoleKit-0.1.0-5.fc7                    dist-fc7              davidz
ElectricFence-2.2.2-20.2.2                dist-fc6              jkeating
GConf2-2.16.0-6.fc7                       dist-fc7              mclasen
ImageMagick-               dist-fc6-updates      nmurray
MAKEDEV-3.23-1.2                          dist-fc6              nalin
MySQL-python-1.2.1_p2-2                   dist-fc7              katzj
NetworkManager-0.6.5-0.3.cvs20061025.fc7  dist-fc7              caillon
ORBit2-2.14.6-1.fc7                       dist-fc7              mclasen

The output gives you not only the latest builds, but which tag they have been inherited from and who built them (note: for builds imported from beehive the “built by” field may be misleading).


We’ve tried to make Koji self-documenting wherever possible. The command line tool will print a list of valid commands and each command supports –help. For example:

$ koji help

Koji commands are:
build                Build a package from source
cancel-task          Cancel a task
help                 List available commands
latest-build         Print the latest builds for a tag
$ koji build --help

usage: koji build [options]  tag URL
(Specify the --help global option for a list of other help options)

-h, --help            show this help message and exit
--skip-tag            Do not attempt to tag package
--scratch             Perform a scratch build
--nowait              Don't wait on build

You can see administrator-only command help with –admin. Most users will never use these additional commands, but if you’re setting up your own Koji system, you may find them very useful.

$ koji help --admin
Available commands:
        add-external-repo         Create an external repo and/or add one to a tag
        add-group                 Add a group to a tag
        add-group-pkg             Add a package to a group's package listing

Koji Deployments

Koji is also known to be used in many places, and we track them on this page. Feel free to add your entry. There is no additional obligation to you for doing so. :)

Koji Contributor Guides

If you’re interested in submitting patches, writing documentation, or filing bugs this section is for you. In time this will be the best place to learn how to get involved.

Indices and tables